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press 'f' to cycle through depth test funcs

This commit is contained in:
Brian Paul 2008-09-05 12:59:40 -06:00
parent eb5b16d278
commit 8df4c3a21f
1 changed files with 26 additions and 0 deletions
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26
progs/trivial/tri-z.c
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@ -37,9 +37,27 @@
#include <GL/glut.h>
#include <stdlib.h>
#include <stdio.h>
static int leftFirst = GL_TRUE;
static struct { GLenum func; const char *str; } funcs[] =
{
{ GL_LESS, "GL_LESS" },
{ GL_LEQUAL, "GL_LEQUAL" },
{ GL_GREATER, "GL_GREATER" },
{ GL_GEQUAL, "GL_GEQUAL" },
{ GL_EQUAL, "GL_EQUAL" },
{ GL_NOTEQUAL, "GL_NOTEQUAL" },
{ GL_ALWAYS, "GL_ALWAYS" },
{ GL_NEVER, "GL_NEVER" },
};
#define NUM_FUNCS (sizeof(funcs) / sizeof(funcs[0]))
static int curFunc = 0;
static void init(void)
{
glEnable(GL_DEPTH_TEST);
@ -72,6 +90,9 @@ void display(void)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
printf("GL_DEPTH_FUNC = %s\n", funcs[curFunc].str);
glDepthFunc(funcs[curFunc].func);
if (leftFirst) {
drawLeftTriangle();
drawRightTriangle();
@ -99,6 +120,11 @@ void reshape(int w, int h)
void keyboard(unsigned char key, int x, int y)
{
switch (key) {
case 'f':
case 'F':
curFunc = (curFunc + 1) % NUM_FUNCS;
glutPostRedisplay();
break;
case 't':
case 'T':
leftFirst = !leftFirst;